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TDR questions

Hi All

Currently I am using a TDR system supplied by Campbell Scientific and
comprises CS615 sensors and a CR10X logger.   I need to measure the soil
water contents on different silvicultural treatments. Now these plots are
really large and I will need to have cables up to 200m in length between the
logger and sensor. Does the cable length affect the accuracy of the reading
and what is the maximum cable length that can be used with these sensors?
Second, I suppose like the neutron probe the best way to calibrate the
sensors is gravimetrically?  Anyone else using the same equipment?

Any comments or suggestions?

Regards

Luke


Luke Esprey
BSc (Hons), MSc (Hydrology)
>Soilwater Research Officer                         
>Institute for Commercial Forestry Research  
>P.O. Box 100281, Scottsville, 3209, Republic of South Africa
>                                             
e-mail   lukes@icfr.unp.ac.za 
Tel:      Int+27 331 62314
Fax:     Int+27 331 68905
URL:    http://www.icfrnet.unp.ac.za/~lukes/index.ssi 
    ==> GPS : S29,37,575' E30,24.379' <==